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FAQ

Category: Installation, Operation, SimpleSYN Mobile, Version 2.x / 3.x

You do not need any additional apps on the mobile device, not even the Outlook app (not supported).

Use the integrated standard apps of the respective system on your mobile device: :

ForAndroidApple iOS / iPadOS
EMails Gmail app Apple Mail app
Tasks Gmail app Apple reminders app
Appointments Google calendar app Apple calendar app
Contacts Google contacts app Apple contacts app
Notes

Android devices do not have a built-in default app for managing notes.
Therefore, you need to use a third-party app on your Android device

 Apple notes app

Category: Installation, SimpleSYN Mobile, Version 2.x / 3.x

SimpleSYN Mobile by default uses the following network connection. Those must be allowed::

DNSIP addressesPorts

Desktop app outgoing

simplesyn.app
relay.simplesyn.app
activation.simplesyn.net

40.114.172.2

82.165.22.228

443

443

Desktop app incoming (local computer only)

localhost

127.0.0.1

9238 (default port, configurable)

Device outgoing

simplesyn.app
autodiscover.simplesyn.app
*.simplesyn.app (each installation will get its own sub domain)

40.114.172.2

443

Note: The IP addresses in use may be changing.

Category: General, Installation, SimpleSYN Mobile, Version 2.x / 3.x

You need SimpleSYN Standard or SimpleSYN Business and also SimpleSYN Mobile.

With SimpleSYN Standard or Business you can synchronize Outlook between multiple Windows PCs. If you still want to synchronize mobile devices (smartphones, tablets), then you also need SimpleSYN Mobile.

With SimpleSYN Mobile you can synchronize Outlook on a Windows PC with up to 5 devices (smartphones, tablets).

Category: General, Version 5.x, Version 6.x

First, empty the Deleted Items folder in Outlook if you no longer need the items.

Also check in the SimpleSYN main window under “Options > Advanced Options” how the “Remove backed up items” selection is set under “Backup”. If the entry is set to “never”, then set a different selection (e.g. after 14 days). Save the changes.

The SimpleSYN backup folder in Outlook is then automatically reduced in size in the background and the old backups are deleted.

Category: Troubleshooting, Version 2.x / 3.x

Restart the Windows PC (do not click “Shut down” and then turn the PC back on, but click “Restart”).

If the behavior occurs again, please send us the log files.

SimpleSYN Mobile includes a built-in function for sending feedback and diagnostic data.

  1. Click on "Information" in the main window and click on "Feedback".
  2. In the next dialog, you can describe your problem and submit your message. The "Include diagnostic data" checkbox shouldbe checked so that we can analyze the problem in detail.

Category: General, Version 5.x, Version 6.x

The trial versions of SimpleSYN Standard, Business, and Mobile offer the full range of features.

During the trial period, SimpleSYN Standard and Business will only display a notification window upon startup, indicating the remaining trial time, which you must manually confirm.

You can test SimpleSYN free of charge and without obligation for 30 days. After the trial period, further use without a license is no longer possible.

Category: Troubleshooting, Version 5.x, Version 6.x

Please make a Outlook repair installation on this computer. Please follow this instruction:
https://support.office.com/en-us/Article/Repair-an-Office-application-7821d4b6-7c1d-4205-aa0e-a6b40c5bb88b

Important:

Choose a full online Outlook repair installation and NOT a quick repair.

Category: Troubleshooting, SimpleSYN Mobile, Version 2.x / 3.x

If you want to make a backup of your Outlook data files, disable the synchronization of SimpleSYN Mobile and close the main window. SimpleSYN Mobile then no longer accesses the data files. After the backup, you can re-enable synchronization.

To deactivate the synchronization, right-click on the SimpleSYN Mobile icon in the notification area and select "Disable synchronization" from the context menu.

Category: Troubleshooting, Version 5.x, Version 6.x

IMAP accounts store your emails directly on your email provider's server. This means your emails are automatically synchronized across all your devices.

Important:
Since IMAP already automatically synchronizes email folders (such as Inbox, Sent Items), additional synchronization of these folders with SimpleSYN is not possible. This would lead to conflicts. Therefore, SimpleSYN does not display these email folders in the "Synchronization Settings" on the client.

 Even though email folders cannot be synchronized with IMAP, other local Outlook data such as:

  • Calendar
  • Contacts
  • Tasks
  • Notes

can be easily synchronized with SimpleSYN. 

If you also want your email folders to be synchronized via SimpleSYN, you should use a POP3 account on all PCs instead.

Category: Troubleshooting, Version 5.x, Version 6.x

If SimpleSYN cannot establish a connection, please note the following:

  • Installation and execution
    Make sure SimpleSYN is installed and running on both the client and server computers.
  • Correct configuration
    One computer must be configured as the SimpleSYN server, and the other PCs as SimpleSYN clients.
  • Use the same major version
    All computers must be using the same major version of SimpleSYN (e.g., version 6.x). Different major versions (e.g., 5.x and 6.x) are incompatible. You can find the version number in the main window under "Information."
  • Internet connection
    All computers must be connected to the Internet.
  • Check the date and time
    Check that the Windows time, time zone, and date are set the same on all computers.

If these requirements are met, check the "Status" message on the client.

If the client displays "not connected":

  • Open SimpleSYN on the server and go to "Options" to display the server ID.
  • Open SimpleSYN on the client and go to "Options > Connect to a different server."
  • Enter the server ID there.
  • Save the settings.

If the client displays "Authentication failed":

  • Open SimpleSYN on the server.
  • Go to "Synchronization Settings > Manage Users."
  • Select "All Users", assign a new password, and save the page.
  • Open SimpleSYN on the client.
  • Go to "Options" and make sure:
    • "Default" is selected for "Login."
    •  In the "Password" field, enter the new password you assigned on the server.
    • Save the settings.

Category: Troubleshooting, Version 5.x, Version 6.x

If SimpleSYN (Standard or Business) suddenly doesn’t start and the icon is no longer visible in the Windows taskbar, this is usually caused by an issue accessing the “SimpleSYN.config” file.

Here’s how to fix it step by step:

  1. Close Outlook if it’s currently running.

  2. Open Windows Explorer and navigate to the following folder, depending on your SimpleSYN version:

    • Version 4:
      C:\Users\[Your Username]\AppData\Local\SimpleSYN\4.0.0.0
    • Version 5:
      C:\Users\[Your Username]\AppData\Local\SimpleSYN\5.0.0.0
    • Version 6:
      C:\Users\[Your Username]\AppData\Local\SimpleSYN\6.0.0.0

  3. Locate the file named “SimpleSYN.config” in that folder.

  4. Delete this file.

  5. Restart SimpleSYN. The file will be automatically recreated.

After restarting, SimpleSYN should work normally again. You’ll just need to reactivate it once using your license file.

Don’t have your license file anymore?

No worries – simply contact the SimpleSYN Support Team to retrieve your license.

Category: Operation, Version 5.x, Version 6.x

SimpleSYN does not synchronize your Outlook data at fixed intervals, but rather as needed. As soon as the SimpleSYN client and server are connected, synchronization runs automatically and almost in real time.

After the initial synchronization, only actual changes to your Outlook data are synchronized – for example, new emails, modifications, or deletions.

Example:
If you create a new calendar appointment, edit, delete, or move an existing one, this change is immediately synchronized across all connected computers. SimpleSYN checks whether the appointment already exists in the calendar.

  • If the appointment does not exist yet, it will be synchronized.
  • If it already exists, it will only be synchronized if it has been modified.

If a computer is currently unavailable, synchronization will automatically resume as soon as the devices are reconnected.

Category: General, Version 5.x, Version 6.x

How to remove an old Client PC from the Server PC in SimpleSYN:

  1. Open the SimpleSYN main window on the server PC.
  2. Press the Alt key to display the menu bar.
  3. In the View menu, click on Status Properties.
  4. Switch to the General tab.
  5. In the list, find the entry for the old PC or user you want to remove.
  6. Select the corresponding entry and click Remove.

Category: Operation, Version 5.x, Version 6.x

The SimpleSYN Business Edition can be run as a Windows service. When the option “Start as Windows service” is enabled in the advanced settings, SimpleSYN will automatically start in the background during Windows startup—without requiring a user to log in.

The SimpleSYN Standard Edition does not support this feature. In this version, synchronization only occurs when a user is logged into the computer and SimpleSYN is running.

Category: Installation, Version 5.x, Version 6.x

You can easily upgrade Outlook to a newer version – there's no need to uninstall the previous version. SimpleSYN will automatically detect the new Outlook version.

Important:
Make sure to install Outlook in the same bit version as before – either 32-bit or 64-bit.

If you want to install Outlook in a different bit version than the previous one, please follow these steps:

  1. First, uninstall SimpleSYN.
  2. Then, update Outlook.
  3. Finally, reinstall SimpleSYN.

Category: Purchase, SimpleSYN Mobile, Version 2.x / 3.x

Licenses are offered as a one time payment or by subscription.

One-time payment:
With a one-time payment, there are no additional monthly or annual fees. The license entitles you to use the currently licensed major version (e.g., version 3.0). Minor updates within this version (e.g., from 3.0 to 3.0.1) are included free of charge. Upgrading to a new major version (e.g., from 3.x to 4) is subject to a fee but is, of course, optional.

Subscription:
With a subscription license, all minor updates and upgrades to new major versions are included.

More information

Category: Installation, Version 6.x

SimpleSYN supports the following Windows® systems and Outlook® versions:

Microsoft® Windows®

  • Windows® 11 (x86/x64)
  • Windows® 10 ab Version 1909 (x86/x64)
  • Windows® Server 2019 (x86/x64)

Microsoft® Outlook®

  • Microsoft/Office 365® mit Outlook® (x86/x64)
  • Outlook® 2024, 2021, 2019, 2016, 2013 (x86/x64)

Important: The classic Outlook for Windows is supported - not the new Outlook app.

Please note:

  • An active internet connection is required for synchronization (applies to SimpleSYN Business and Standard).
  • All participating Windows PCs must be turned on at the same time for synchronization, as your Outlook data is not stored in the cloud.
  • The Windows service is only available in the SimpleSYN Business version. In the SimpleSYN Standard version, a Windows user must be logged on to the computer for synchronization.
  • Synchronization of external data sources (e.g. Google Calendar or iCloud) is not supported.